Will the US presidential debates change the course of the election?

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On the 29th September the two US presidential candidates Donald Trump and Joe Biden will take part in the first of three 90-minute live televised debates ahead of the presidential election in November. Tanya Beckett asks can the debates affect the outcome of the election? (Composite image of Joe Biden (Credit: Jonathan Ernst/Reuters) and Donald Trump (Credit: John G Mabanglo/EPA)